phy: qcom: qmp-pcie: restore compatibility with existing DTs

[ Upstream commit 912cee11c14376a6f707d72fcaf343a40bff48e8 ]

Existing device trees specify only a single clock-output-name for the
PCIe PHYs. The function phy_aux_clk_register() expects a second entry in
that property. When it doesn't find it, it returns an error, thus
failing the probe of the PHY and thus breaking support for the
corresponding PCIe host.

Follow the approach of the combo USB+DT PHY and generate the name for
the AUX clocks instead of requiring it in DT.

Fixes: 583ca9ccfa80 ("phy: qcom: qmp-pcie: register second optional PHY AUX clock")
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240614-fix-pcie-phy-compat-v3-1-730d1811acf4@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 6c796723c8f5a02272d49684410bc46d528046a9..8fcdcb193d2414e135bdbfceca8ce7844ed1a934 100644 (file)
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -3730,14 +3730,11 @@ static int phy_aux_clk_register(struct qmp_pcie *qmp, struct device_node *np)
 {
        struct clk_fixed_rate *fixed = &qmp->aux_clk_fixed;
        struct clk_init_data init = { };
-       int ret;
+       char name[64];
 
-       ret = of_property_read_string_index(np, "clock-output-names", 1, &init.name);
-       if (ret) {
-               dev_err(qmp->dev, "%pOFn: No clock-output-names index 1\n", np);
-               return ret;
-       }
+       snprintf(name, sizeof(name), "%s::phy_aux_clk", dev_name(qmp->dev));
 
+       init.name = name;
        init.ops = &clk_fixed_rate_ops;
 
        fixed->fixed_rate = qmp->cfg->aux_clock_rate;